Respiratory mask frame



FIG. 1 is a front perspective view of a respiratory mask frame according to a first embodiment showing our new ornamental design;

FIG. 2 is a reverse perspective view thereof;

FIG. 3 is a front view thereof;

FIG. 4 is a rear view thereof;

FIG. 5 is a top view thereof;

FIG. 6 is a bottom view thereof;

FIG. 7 is a right side view thereof;

FIG. 8 is a left side view thereof;

FIG. 9 is a front perspective view of a respiratory mask frame according to a second embodiment showing our new ornamental design, with the vent portions portrayed in broken lines;

FIG. 10 is a reverse perspective view thereof;

FIG. 11 is a front view thereof;

FIG. 12 is a rear view thereof;

FIG. 13 is a top view thereof;

FIG. 14 is a bottom view thereof;

FIG. 15 is a right side view thereof; and,

FIG. 16 is a left side view thereof.

The broken lines of the respiratory mask frame are for illustrative purposes only to indicate environmental surroundings and do not constitute a portion of the claimed design. 

The ornamental design for a respiratory mask frame, as shown and described. 